レンタルサーバー速度比較18社！一番速いのはKinsta【2025年最新版】
レンタルサーバーの速度は、あなたのWebサイトの成功を大きく左右します。しかし、どのレンタルサーバーが本当に速いのか、正確な情報を見つけるのは困難です。各社が「高速」をうたう中、実際の性能には大きな差があります。
そこで本記事では、国内外の主要レンタルサーバー18社を徹底的に測定し、本当に速いサーバーをランキング形式で発表します。WordPress環境での実測値をもとに、用途別の最適解も詳しく解説。
あなたのサイトに最適なレンタルサーバーを見つけて、ビジネスを成功に導きましょう。
レンタルサーバーの速度がビジネスに与える致命的な影響
レンタルサーバーの速度が与える影響の大きさは想像に難くありませんが、調査報告を知ると影響は致命的なほど大きいとわかります。
人はイライラするとどうなるでしょうか？ ページの読み込みに3秒かかると、消費者のおよそ半数は少なくとも1回はページの更新を試みると答えています。しかし、22%はタブを閉じ、14%は競合サイトに移動すると答えています。1日1,000人の訪問者がいるなら、360人の見込み客を失うことになります。これは大きな損失です。（
人はイライラするとどうなるでしょうか？
ブラウザキャッシュ、画像最適化、そしてモバイルページの表示領域でのコンテンツ優先表示を組み合わせることで、Dakineはトップページの読み込み時間を55%、カテゴリーページを48%、商品ページを65%短縮しました。その結果、翌年にはモバイル流入が31%増加し、モバイル売上は45%増、タブレット売上も4%増加しました。（Dakineは、ブラウザキャッシュの活用、画像の最適化、モバイルページでの表示領域（ファーストビュー）におけるコンテンツの優先表示といった工夫を組み合わせることで、トップページの読み込み時間を55%、カテゴリーページを48%、商品ページを65%短縮しました。その結果、翌年にはモバイルからのトラフィックが31%増加し、モバイルでの売上は45%アップ、タブレットでの売上も4%伸びました。）
ミリ秒が利益を生む: モバイル速度が事業の成長を左右する理由
ですから、サイトの土台になるサーバーの速度は非常に重要です。
18社レンタルサーバーの実証速度データ
速度測定環境とツールの選定理由
測定は、すべてWordPress公式テーマを使いました。また、文字数や画像サイズなどが同じになるよう、それぞれのデモサイトは、WordPressユニットテストをインストールしました。
計測は、Googleが提供するPageSpeed Insightsです。特に、TTFB（初回バイト応答時間）を重視しました。ページ内の最大コンテンツが表示されるなら、閲覧ユーザーは「サイトの表示が遅い」とは感じにくくなるからです。
※一部、Googleの速度測定ツール（PageSpeed Insights）ではなくデベロッパツールで確認しています。
速度測定で分かった衝撃の結果！18社レンタルサーバー完全ランキング
【1位】Kinsta – 世界最速クラスのWordPress専用サーバー
"Kinsta" is a top-tier hosting service with data centers in 37 locations around the world. In our measurements, it ranked No. 1. It is undeniably expensive, but if you want a server built entirely around comfort and performance, it is easy to recommend. Its chat support is available in Japanese as well.
30-day money-back guarantee
| Server type | Managed dedicated server |
| Speed (TTFB) | 30ms |
| Recommended plan and term | Single35k |
| Trial / money-back guarantee | 30-day money-back guarantee |
| Monthly price (12-month contract) | 4,407 yen |
| Initial setup fee | Free |
| Free domain | None |
| Support | 24/7 chat (Japanese support)、Email |
| Uptime | 99.9% |
| Storage | 10GB |
| Number of databases | 1 |
| Security | malware scan、WAF、firewall、DDoS attack protection、Google Cloudfirewall |
| SSL | Free custom SSL |
| Backup | 14-day automatic backup |
| Email accounts | None |
| Email security | None |
| Server / website migration service | Free |
| WordPress preinstall | Yes |
| CDN | Free (125GB) |
| Data center | Johannesburg, South Africa, Changhua County, Taiwan, Hong Kong, Tokyo, Osaka, Seoul, Korea, Mumbai, India, Delhi, India, Jurong West, Singapore, Jakarta, Indonesia, Sydney, Australia, Melbourne, Australia, Warsaw, Poland, Hamina, Finland, Madrid, Spain, Saint-Ghislain, Belgium, London, UK, Frankfurt, Germany, Emden, Netherlands, Zurich, Switzerland, Milan, Italy, Paris, France, Dammam, Saudi Arabia, Tel Aviv, Israel, Montreal, Canada, Toronto, Canada, Sao Paulo, Brazil, Santiago, Chile, Council Bluffs, Iowa, United States, Moncks Corner, South Carolina, United States, Ashburn, Virginia, United States, Columbus, Ohio, United States, Dallas, Texas, United States, The Dalles, Oregon, United States, Los Angeles, California, United States, Salt Lake City, Utah, United States, Las Vegas, Nevada, United States |
KinstaはGoogle Cloud Platformの「C2マシン」を使用したマネージドWordPressホスティングサービスです。平均応答時間は200ms以下を実現し、世界35箇所のデータセンターから最適な場所を選択できます。
技術的な特徴として、PHP 8.3、MariaDB、Nginx、LXDコンテナを採用しており、従来の共有サーバーとは異なる完全分離環境を提供します。また、Kinsta独自の「MyKinsta」管理画面では、リアルタイムでのパフォーマンス監視が可能です。
月額料金は$35から（年間契約で$30）と高価格帯ですが、企業サイトやトラフィックの多いメディアサイトでは、その投資効果は十分に見込めます。
弊社が検証した結果、日本国内のサーバーだけでなく、世界中のサーバーで速度No.1になったのがKinstaです。初回バイト応答時間（TTFB）で30msを記録しました。特に、アクセス数の多い法人のホームページやECサイト、売上のあるアフィリエイトサイトを運用しており、速さに問題を抱えているなら
速度問題を解決する最終手段、それが
【2位】Hostinger – 真のコスパ最強サーバー
【Hostinger】 started in Lithuania and is used by more than 29 million people. Its backup system makes it easy to keep WordPress data safe, and because its overseas plans offer generous server capacity, it also fits somewhat larger sites well.
30-day money-back guarantee
| Server type | Shared hosting |
| Speed (TTFB) | 31ms |
| Recommended plan and term | Premium Web Hosting 12months |
| Trial / money-back guarantee | 30-day money-back guarantee |
| Monthly price (12-month contract) | US$4.50 (438 yen) |
| Initial setup fee | Free |
| Free domain | 1 free in the first year |
| Support | 24/7 chat |
| Uptime | 99.9% |
| Storage | 100GB |
| Number of databases | 50 |
| Security | DDoS attack protection、malware scan、firewall、Cloudflare protected nameserver、Secure Access Manager |
| SSL | FreeSSL |
| Backup | 7-day backup & 7-week backup |
| Email accounts | 100 |
| Email security | — |
| Server / website migration service | None |
| WordPress preinstall | None |
| CDN | Free |
| Data center | France, Lithuania, Netherlands, UK, India, Indonesia, Singapore, United States, Brazil |
Waiting for server response refers to TTFB.
「Single プラン」では、ディスク容量50GB、転送量100GB、WordPress最適化が利用可能です。また、「Hostinger」独自の管理画面「hPanel」により、初心者でも簡単にサイト管理が行えます。
月額料金は$1.39から（年間契約時）で、30日間返金保証、無料独自SSL、24時間サポートが利用できます。
Pricing starts at $1.39 per month on annual billing, and you still get a 30-day money-back guarantee, free SSL, and 24-hour support.
Hostinger stood out for how thoughtful its support was and how easy its control panel was to use. When you factor in both speed and price, it is the true value champion.
[No. 2] XServer Business: outstanding stability for corporate sites
"Xserver Business" is the business-oriented platform from XServer Inc., the company behind Japan's No. 1 market-share hosting brand. It tied for No. 2 in our measurements. It is an especially strong candidate when migrating a corporate website, and server migration itself is free.
Through October 7, 2025: initial setup fees waived (normally 16,500 to 385,000 yen), plus free server migration support
| Server type | Shared hosting / managed dedicated server (virtual type) / managed dedicated server (physical type) |
| Speed (TTFB) | 40ms |
| Recommended plan and term | Shared hosting Standard 12 months |
| Trial / money-back guarantee | 10-day free trial |
| Monthly price (12-month contract) | 2,926 yen |
| Initial setup fee | 16,500 yen |
| Free domain | 2 free forever |
| Support | Phone and email (weekdays 10:00-18:00) |
| Uptime | 99.99% guaranteed |
| Storage | 700GB |
| Number of databases | Unlimited |
| Security measures | WAF / website tampering alerts / SECOM security diagnosis |
| SSL | Free custom SSL / Cloud SSL / Speed Authentication SSL / Quick SSL Premium |
| Backup / restore | 14-day automatic backup / free restore |
| Email accounts | Unlimited |
| Email security | Antivirus / spam filter / high-performance spam filter / POP over SSL / SMTP over SSL / IMAP over SSL / DKIM / DMARC |
| Server / website migration service | fully managed free(first time only, up to 10 items) |
| WordPress preinstall | Yes |
| CDN | None |
独自機能として「設定代行サービス」が含まれており、サーバー移転作業を無料で代行してくれます。また、企業サイトに必要な「独自SSL証明書」や「Web改ざん検知」機能も標準装備しています。
月額料金は3,762円から（12ヶ月契約時）で、電話サポートは平日10:00-18:00の対応となっています。
Pricing starts at 3,762 yen per month on a 12-month contract, and phone support is available on weekdays from 10:00 to 18:00.
If you want the reassurance of a long-established domestic hosting company together with world-class speed, choose XServer Business. It is especially well suited to small and large businesses.
[No. 3] wpX Speed: remarkable performance built specifically for WordPress
"wpX Speed" is a cloud-based hosting service from ShinCloud. Its pay-as-you-go system starts at 2.2 yen per hour, so it is easy to begin with. Features such as reserved resources and automatic scale-up keep performance comfortable in a very cloud-like way.
14-day free trial
| Server type | Shared hosting |
| Speed (TTFB) | 40ms |
| Recommended plan and term | W1 12 months |
| Trial / money-back guarantee | 14 days |
| Monthly price (12-month contract) | Hourly rate 2.2 yen*, up to 1,320 yen* |
| Initial setup fee | Free |
| Free domain | None |
| Support | Phone and email (weekdays 10:00-18:00) |
| Uptime | Undisclosed |
| Storage | 200GB* |
| Number of databases | Unlimited |
| Security measures | WAF、access restriction from foreign IP addresses、login attempt limits、bulk comment and trackback restriction、comment and trackback restriction from foreign IP addresses、 |
| SSL | Free custom SSLL, custom SSL |
| Backup / restore | 7-day automatic backup free, free restore |
| Email accounts | Unlimited |
| Email security | SMTP-AUTH、IMAP |
| Server / website migration service | None |
| WordPress preinstall | None |
| CDN | None |
特筆すべきは「リバースプロキシ」機能で、静的コンテンツを自動的にキャッシュし、サーバー負荷を大幅に軽減します。また、「オートスケール機能」により、アクセス急増時にも自動的にリソースを拡張します。
月額料金は1,320円から（12ヶ月契約時）で、無料独自SSL、自動バックアップ機能が標準装備されています。
Pricing starts at 1,320 yen per month on a 12-month contract, and free SSL plus automatic backups are included by default.
I recommend wpX Speed for business homepages run by sole proprietors and small offices, as well as for affiliate sites. At this speed and this price, the value is outstanding.
[No. 4] Lolipop!: a fast host with outstanding value
"LOLIPOP" is a long-established and widely used hosting service available at a low price. Even with its 99.99% uptime, the Light plan that supports WordPress starts from a very low monthly cost, and every plan offers excellent value for money.
For corporations established less than one year ago through December 21: 12 months of the High-Speed plan free, one domain free forever on contracts of 12 months or longer, plus a 10-day free trial
| Server type | Shared hosting |
| Speed (TTFB) | 80ms |
| Recommended plan and term | Light 12 months |
| Trial / money-back guarantee | 10-day free trial |
| Monthly price (12-month contract) | 495 yen |
| Initial setup fee | Free |
| Free domain | 1 free forever |
| Support | chat, Email (weekdays 10:00-18:00) |
| Uptime | 99.99% |
| Storage | 350GB |
| Number of databases | 50 |
| Security measures | overseas attack guard, WAF, virus check |
| SSL | Free custom SSL, custom SSL（Pro） |
| Backup / restore | Backup none (Standard plan and below), 7-generation backup (paid) |
| Email accounts | Unlimited |
| Email security | POP/POP over SSL、IMAP/IMAP over SSL、SMTP/SMTP over SSL、spam filter |
| Server / website migration service | 33,000 yen |
| WordPress preinstall | Yes |
| CDN | None |
技術面では、「LiteSpeed Cache」プラグインとの連携により、WordPressサイトの表示速度を大幅に改善します。また、「モジュール版PHP」の採用により、従来のCGI版と比較して約10倍高速な処理が可能です。
月額料金は550円から（36ヶ月契約時）と非常にリーズナブルで、個人ブログから小規模ビジネスサイトまで幅広く対応できます。
Pricing starts at 550 yen per month on a 36-month contract, making it highly approachable for personal blogs and small business sites.
Because Lolipop! is both inexpensive and fast, it is ideal if you want to launch a site at low cost, especially a personal blog. I myself started my very first WordPress blog on Lolipop!.
[No. 5] Star Rental Server: a high-performing hidden gem
"Star Rental Server" is a tremendous value host from Netowl that even lets you start for free. Despite being free, it is impressively fast and feature-rich. Its paid Light plan is also inexpensive, so it is easy to recommend to people focused on value.
10-day free trial for paid plans
| Server type | Shared hosting |
| Speed (TTFB) | 90ms |
| Recommended plan and term | Free |
| Trial / money-back guarantee | None |
| Monthly price (12-month contract) | Free |
| Initial setup fee | Free |
| Free domain | None |
| Support | None |
| Uptime | Undisclosed |
| Storage | 3GB |
| Number of databases | 5 |
| Security measures | WAF、login attempt limits、access restriction from foreign IP addresses、bulk comment and trackback restriction、comment and trackback restriction from foreign IP addresses |
| SSL | Free custom SSL, optional custom SSL |
| Backup / restore | None |
| Email accounts | None |
| Email security | Antivirus, spam filter, POP over SSL, SMTP over SSL, IMAP over SSL, DKIM, DMARC |
| Server / website migration service | None ※WordPress migration tool available |
| WordPress preinstall | Yes |
| CDN | None |
独自の「スターサーバー高速化機能」では、圧縮転送、ブラウザキャッシュ、Keep-Alive設定などを自動最適化します。また、「WordPress簡単インストール」機能により、初心者でも簡単にサイト構築が可能です。
月額料金は550円から（12ヶ月契約時）で、独自SSL証明書、自動バックアップ機能が無料で利用できます。
Pricing starts at 550 yen per month on a 12-month contract, and free dedicated SSL plus automatic backups are available.
Star Rental Server is a free host, yet it produced results better than some paid high-speed hosts. It almost feels like price destruction.
[No. 6] Rakko Server: an optimized host built by an SEO company
"Rakko Server" is a hosting service that makes selling a site smooth and one-stop. If you think all the way through to the eventual end of a site, it is one of the easiest and most capable domestic services. It is inexpensive, easy for getting started with WordPress, and especially attractive for individual users.
30-day free trial
| Server type | Shared hosting |
| Speed (TTFB) | 120ms |
| Recommended plan and term | RK1 12 months |
| Trial / money-back guarantee | 30-day free trial |
| Monthly price (12-month contract) | 440 yen |
| Initial setup fee | Free |
| Free domain | 1 free in the first year |
| Support | Email (weekdays 10:00-19:00) |
| Uptime | Undisclosed |
| Storage | 100GB |
| Number of databases | Unlimited |
| Security measures | WAF、IPS/IDS |
| SSL | Free custom SSL, custom SSL |
| Backup / restore | 30-day automatic backup free, free restore |
| Email accounts | Unlimited |
| Email security | Email encryption, POP/POPS, SMTP/SMTPS, IMAP/IMAPS, virus check, spam filter, custom filter |
| Server / website migration service | 16,500 yen |
| WordPress preinstall | Yes |
| CDN | None |
技術的特徴として、「WordPress自動最適化」機能があり、画像圧縮、CSS/JavaScript最適化、キャッシュ設定などを自動で実行します。また、「かんたんSSL」により、証明書の設定が1クリックで完了します。
月額料金は385円から（12ヶ月契約時）で、ラッコキーワードなどのSEOツールとの連携機能も提供されています。
Pricing starts at 385 yen per month on a 12-month contract, and integration with SEO tools such as Rakko Keyword is also available.
Rakko Server is already well known in the M&A world because the company is strong in website sales, but it is still relatively minor in hosting. Even so, it is unquestionably fast.
[No. 7] XServer: the proven performance behind Japan's largest market share
"Xserver" is a long-established high-speed host with the largest market share in Japan. It is popular with both individuals and businesses. It has very few real weaknesses, while offering stability, features, and support at a high level. With cashback, the effective monthly cost can be very attractive.
50% cashback through September 34, 2025, plus a 10-day free trial
| Server type | Shared hosting |
| Speed (TTFB) | 130ms |
| Recommended plan and term | Standard 12 months |
| Trial / money-back guarantee | 10-day free trial |
| Monthly price (12-month contract) | 880 yen |
| Initial setup fee | Free |
| Free domain | 2 free forever |
| Support | Phone, email, and chat (weekdays 10:00-18:00) |
| Uptime | 99.99% |
| Storage | 500GB |
| Number of databases | Unlimited |
| Security measures | website tampering alerts、SECOM security diagnosis、WAF, access restriction from foreign IP addresses, bulk comment and trackback restriction, comment and trackback restriction from foreign IP addresses, antivirus, spam filter, high-performance spam filter, |
| SSL | Free custom SSL, optional custom SSL |
| Backup / restore | 14-day automatic backup free, free restore |
| Email accounts | Unlimited |
| Email security | POP over SSL、SMTP over SSL、IMAP over SSL、DKIM、DMARC |
| Server / website migration service | 33,000 yen |
| WordPress preinstall | Yes |
| CDN | None |
「X10プラン」では、ディスク容量300GB、転送量無制限、MySQL無制限が利用可能です。また、「WordPress簡単インストール」、「自動バックアップ」、「WAF（Webアプリケーションファイアウォール）」などの機能が標準装備されています。
月額料金は1,100円から（12ヶ月契約時）で、24時間365日の電話・メールサポートが利用できます。
Pricing starts at 1,100 yen per month on a 12-month contract, and phone and email support are available 24 hours a day, 365 days a year.
XServer is high quality in every respect, including speed. If you care about more than speed alone, XServer is an excellent choice.
[No. 8] mixhost: a next-generation host powered by overseas technologies
"mixhost" is a high-speed cloud hosting service from AzPocket. Because it also offers overseas server locations, it is especially appealing to individuals who want to publish to audiences abroad. WordPress is preinstalled when you sign up, so it is easy to get started.
Up to 55% off on the first contract, an additional 25% discount, and a 30-day money-back guarantee
| Server type | Shared hosting / dedicated cloud server |
| Speed (TTFB) | 150ms |
| Recommended plan and term | Shared hosting Light 12 months |
| Trial / money-back guarantee | 30-day money-back guarantee |
| Monthly price (12-month contract) | 594 yen |
| Initial setup fee | Free |
| Free domain | 1 free forever |
| Support | |
| Uptime | 99.99% guaranteed |
| Storage | 100GB |
| Number of databases | Unlimited |
| Security measures | WAF / DDoS attack protection / malware detection and removal |
| SSL | Free custom SSL |
| Backup / restore | Standard plan and above have 14-day automatic backup |
| Email accounts | Unlimited |
| Email security | — |
| WordPress preinstall | Yes |
| Server / website migration service | 10,890 yen |
| CDN | None |
| Data center | San Jose, U.S. West Coast |
技術面では、「CloudLinux」により完全なリソース分離を実現し、他ユーザーの影響を受けません。また、「Cloudflare CDN」との連携により、世界中からの高速アクセスが可能です。
月額料金は1,078円から（12ヶ月契約時）で、30日間返金保証、無料独自SSL、自動バックアップが標準装備されています。
Pricing starts at 1,078 yen per month on a 12-month contract, and a 30-day money-back guarantee, free SSL, and automatic backups are included.
mixhost offers affordable cloud storage to hosting customers. On the other hand, its email functionality is relatively weak, such as limits on outgoing mail. For that reason, it is especially suitable for lean small businesses that want to move forward with digital transformation.
[No. 9] ConoHa WING: high speed backed by GMO's technical strength
"ConoHa WING" is a fast host from GMO Internet Group whose number of users continues to grow rapidly, and we use it ourselves. Because WordPress is preinstalled at the time of signup, anyone can start easily. The balance between cost and performance is good, and it is a service we actively use.
Up to 53% off server fees through August 5, 2025, two domains free forever, and the first month free
| Server type | Shared hosting |
| Speed (TTFB) | 160ms |
| Recommended plan and term | Basic 12 months |
| Trial / money-back guarantee | First month free |
| Monthly price (12-month contract) | 971 yen |
| Initial setup fee | Free |
| Free domain | 2 free forever |
| Support | Phone, email, and chat (weekdays 10:00-18:00) |
| Uptime | 99.99% guaranteed |
| Storage | 300GB |
| Number of databases | Unlimited |
| Security measures | WAF / directory access restriction / IP access restriction / vulnerability assessment (Net de Diagnosis) / spam comment and trackback restriction / overseas comment and trackback restriction / overseas access restriction |
| SSL | Free SSL / Alpha SSL / Quick Authentication SSL / Organization Validation SSL / EV SSL |
| Backup / restore | 14-day automatic backup / free restore |
| Email accounts | Unlimited |
| Email security | virus check / spam email filter |
| Server / website migration service | WordPress migration service from 7,678 yen migration tool available free |
| WordPress preinstall | Yes |
| CDN | None |
「ベーシックプラン」では、SSD 300GB、転送量無制限、独自SSL無料が利用可能です。また、「ConoHa WING」独自の管理画面により、サーバー操作が直感的に行えます。
月額料金は1,089円から（12ヶ月契約時）で、WordPress移行代行サービス、自動バックアップ機能が標準装備されています。
Pricing starts at 1,089 yen per month on a 12-month contract, and WordPress migration support plus automatic backups are included by default.
ConoHa WING offers a rich set of AI tools. It can make it easier for beginners to continue blogging and to turn their sites into a source of revenue.
[No. 10] ColorfulBox: speed improved through regional optimization
"ColorfulBox" is a reassuring hosting service known for its strong regional backup system. With eight plans available, you can choose the right level of performance without waste. It is also one of the few hosts that offers 24-hour support.
Up to 50% off server fees through August 31, 2025, up to 10,000 yen in Amazon gift cards, and a 30-day free trial
| Server type | Shared hosting |
| Key feature | Many plans |
| Speed (TTFB) | 190ms |
| Recommended plan and term | BOX1 12 months |
| Trial / money-back guarantee | 30-day money-back guarantee |
| Monthly price (12-month contract) | 638 yen |
| Initial setup fee | Free |
| Free domain | None |
| Support | Business hours: weekdays 09:30-12:00, 13:00-17:30 Phone（24-hour reception）, callback (BOX7 and above), chat, LINE, Email |
| Uptime | Undisclosed |
| Storage | 200GB |
| Number of databases | Unlimited |
| Security measures | WAF, IPS, IDS, virus scan, SiteLock (paid) |
| SSL | Free SSL, custom SSL, shared SSL |
| Backup / restore | 14-day region-based automatic backup free, free restore |
| Email accounts | Unlimited |
| Email security | Email encryption, POP/POPS / SMTP/SMTPS, IMAP/IMAPS, virus check, spam filter, custom filter |
| WordPress preinstall | Yes |
| Server / website migration service | Free |
| CDN | 440 yen~ |
独自機能として「地域別最適化」があり、ユーザーの地域に応じて最適なデータセンターからコンテンツを配信します。また、「自動バックアップ」は過去14日分のデータを保持し、復旧も簡単に行えます。
月額料金は638円から（12ヶ月契約時）で、30日間返金保証、無料独自SSL、電話サポートが利用できます。
Pricing starts at 638 yen per month on a 12-month contract, and a 30-day money-back guarantee, free SSL, and phone support are available.
With ColorfulBox, you can choose whether your region is Tokyo or Osaka. That makes it particularly appealing for local blogs and other sites whose visitors are concentrated in a specific area.
[No. 11] Shin Rental Server: XServer's new brand
"Shin Rental Server" is a fast hosting service from ShinCloud. Its approachable pricing works well even for individuals, and it also runs regular campaigns, so signup timing can matter.
50% cashback through August 6, 2025, plus a 10-day free trial
| Server type | Shared hosting |
| Speed (TTFB) | 200ms |
| Recommended plan and term | Basic 12 months |
| Trial / free period | 10-day free trial |
| Monthly price (12-month contract) | 880 yen |
| Initial setup fee | Free |
| Free domain | 1 free forever |
| Support | Phone and email (weekdays 10:00-18:00) |
| Uptime | Undisclosed |
| Storage | 700GB |
| Number of databases | Unlimited |
| Security measures | SECOM security diagnosis, WAF, ads.txt, login attempt limits, access restriction from foreign IP addresses, bulk comment and trackback restriction, comment and trackback restriction from foreign IP addresses, antivirus, spam filter, |
| SSL | Free custom SSL, optional custom SSL |
| Backup / restore | 14-day automatic backup free, free restore |
| Email accounts | Unlimited |
| Email security | POP over SSL、SMTP over SSL、IMAP over SSL、DKIM、DMARC |
| Server / website migration service | None |
| WordPress preinstall | Yes |
| CDN | None |
「ベーシックプラン」では、ディスク容量300GB、転送量無制限、MySQL無制限が利用可能です。エックスサーバーのノウハウを活かした安定稼働と、新サービスならではの料金体系が特徴です。
月額料金は770円から（12ヶ月契約時）で、独自SSL無料、自動バックアップ、WordPress簡単インストール機能が標準装備されています。
Pricing starts at 770 yen per month on a 12-month contract, and free SSL, automatic backup, and easy WordPress installation are included by default.
[No. 12] Little Server: a lightweight host for small websites
"Little Server" is a budget hosting service. Excluding free hosts, it is one of the cheapest options for individuals, and it still uses NVMe SSD storage to pursue better speed.
Initial setup fee waived through September 30, 2025, 20% off the Little plan, and a 20-day free trial
| Server type | Shared hosting |
| Speed (TTFB) | 200ms |
| Recommended plan and term | Mini 12 months |
| Trial / money-back guarantee | 20-day free trial |
| Monthly price (12-month contract) | 165 yen |
| Initial setup fee | 920 yen |
| Free domain | None |
| Support | Email（Business hoursUndisclosed） |
| Uptime | Undisclosed |
| Storage | 20GB |
| Number of databases | 3 |
| Security measures | IMP |
| SSL | Free SSL, custom SSL (Little plan and above) |
| Backup / restore | 7-day automatic backup free, free restore |
| Email accounts | Unlimited |
| Email security | spam filter |
| Server / website migration service | None |
| WordPress preinstall | Yes |
| CDN | None |
「ワードプレスプラン」では、WordPress専用最適化が施されており、プラグインの動作も軽快です。また、「簡単インストール」機能により、初心者でも簡単にサイト構築が可能です。
月額料金は250円から（12ヶ月契約時）と非常にリーズナブルで、個人ブログや趣味サイトに最適です。
Pricing starts at 250 yen per month on a 12-month contract, making it ideal for personal blogs and hobby sites.
[No. 13] Core Server: a balanced choice focused on value
"Core Server" is a fast host run by GMO Digirock. It offers the affordable V1 plans for individual users as well as the more comfort-oriented V2 plans, so it is easier to find a fit across a wide range of needs.
Through August 31, 2025: one free co.jp domain plus 12 months of V2 server fees free, no initial fee, and a 30-day free trial
| Server type | Shared hosting |
| Speed (TTFB) | 210ms |
| Recommended plan and term | CORE-MINI 12-month contract |
| Trial / money-back guarantee | 30-day free trial |
| Monthly price (12-month contract) | 264 yen |
| Initial setup fee | Free |
| Free domain | None |
| Support | Business hours: 10:00-12:00,13:00-17:00 Phone callback (CORE-B, CORE-C, CORE-Z), Email, chat |
| Uptime | Undisclosed |
| Storage | 250GB |
| Number of databases | 10 |
| Security measures | WAF、IPS/IDS |
| SSL | FreeSSL |
| Backup / restore | 15-generation backup free, free restore |
| Email accounts | 200 |
| Email security | POP/POPS, SMTP/SMTPS, IMAP/IMAPS, virus check, spam filter,DKIM/DMARC |
| WordPress preinstall | None |
| Server / website migration service | None |
| CDN | None |
「CORE-Aプラン」では、ディスク容量200GB、転送量無制限、MySQL無制限が利用可能です。また、「WordPress簡単インストール」、「自動バックアップ」機能が標準装備されています。
月額料金は528円から（12ヶ月契約時）で、独自SSL無料、電話サポートが利用できます。
Pricing starts at 528 yen per month on a 12-month contract, and free SSL plus phone support are available.
[No. 14] DreamHost: the steady reliability of a long-established overseas brand
“DreamHost” is a hosting company based in Los Angeles. One of its strongest attractions is its exceptionally long 97-day money-back guarantee. For an overseas host, that long trial window offers a great deal of reassurance, and pricing remains approachable as well.
97-day money-back guarantee
| Server type | Shared hosting |
| Speed (TTFB) | 400ms |
| Recommended plan and term | WordPress Starter 1 year |
| Trial / money-back guarantee | 97-day money-back guarantee |
| Monthly price (12-month contract) | US$2.95 (432 yen) |
| Initial setup fee | Free |
| Free domain | 1 free for 3 months |
| Support | 24/7 chat、Email、Phone callback |
| Uptime | 100% |
| Storage | 50GB |
| Number of databases | 6 |
| SSL | FreeSSL |
| Backup | Available |
| Email accounts | None |
| Email security | None |
| Server / website migration service | None |
| WordPress preinstall | None |
| CDN | None |
| Data center | Ashburn, Virginia, United States, Hillsboro, Oregon, United States |
「Shared Starterプラン」では、ディスク容量50GB、転送量無制限、WordPress最適化が利用可能です。また、「WordPress.com公式推奨」サーバーとして、WordPressとの親和性が高いです。
月額料金は$2.59から（年間契約時）で、97日間返金保証、無料独自SSL、24時間サポートが利用できます。
Pricing starts at $2.59 per month on annual billing, and you get a 97-day money-back guarantee, free SSL, and 24-hour support.
[No. 15] Bluehost: the officially recommended WordPress host
“Bluehost” is a globally recognized hosting company headquartered in Florida. It is trusted as one of the services officially recommended by WordPress, and despite its quality, pricing remains accessible.
30-day money-back guarantee
| Server type | Shared hosting |
| Speed (TTFB) | 420ms |
| Recommended plan and term | Basic 12 months |
| Trial / money-back guarantee | 30-day money-back guarantee |
| Monthly price (12-month contract) | US$2.95 (432 yen) |
| Initial setup fee | Free |
| Free domain | 1 free in the first year |
| Support | 24/7 chat |
| Uptime | 100% |
| Storage | 10GB |
| Number of databases | 10 |
| Security measures | malware scan、SiteLock |
| SSL | Free custom SSL |
| Backup / restore | None |
| Email accounts | None |
| Email security | None |
| Server / website migration service | None |
| WordPress preinstall | None |
| CDN | Free |
| Data center | Utah, United States, Orem, United States, London, UK, Shanghai, China, Hong Kong, Mumbai, India |
「Basic プラン」では、ディスク容量50GB、転送量無制限、WordPress簡単インストールが利用可能です。また、「Bluehost」独自のWordPress管理画面により、初心者でも簡単にサイト管理が行えます。
月額料金は$2.95から（年間契約時）で、30日間返金保証、無料独自SSL、24時間サポートが利用できます。
Pricing starts at $2.95 per month on annual billing, and a 30-day money-back guarantee, free SSL, and 24-hour support are included.
[No. 16] Sakura Rental Server: trusted stability from a long-standing brand
"Sakura Rental Server" is a long-established service with more than 480,000 active accounts. It used to have a reputation for being slow, but recent server renewals have made it faster, while its affordable pricing has remained unchanged.
14-day free trial
| Server type | Shared hosting |
| Speed (TTFB) | 440ms |
| Recommended plan and term | Standard 12 months |
| Trial / money-back guarantee | 14-day free trial |
| Monthly price (12-month contract) | 550 yen |
| Initial setup fee | Free |
| Free domain | None |
| Support | Business hours: 10:00-18:00 Phone callback booking, chat, Email (reply on the same day or by the next business day) |
| Uptime | 99.99% |
| Storage | 300GB |
| Number of databases | Unlimited |
| Security measures | website tampering alerts (paid), WAF, foreign IP address filtering, anti-relay measures, encryption, |
| SSL | Free shared SSL, custom SSL |
| Backup / restore | 8-generation backups free, free restore |
| Email accounts | Unlimited |
| Email security | POP3, IMAP4, virus check, basic spam email filter, high-accuracy spam email filter |
| WordPress preinstall | None |
| Server / website migration service | None |
| CDN | 100GB per month free |
「スタンダードプラン」では、ディスク容量300GB、転送量無制限、MySQL50個が利用可能です。また、「さくらのレンタルサーバ」独自の管理画面により、細かなサーバー設定が可能です。
月額料金は524円から（年間契約時）で、2週間無料お試し、無料独自SSL、電話サポートが利用できます。
Pricing starts at 524 yen per month on annual billing, and you get a two-week free trial, free SSL, and phone support.
[No. 17] Namecheap: an affordable host from a domain specialist
“Namecheap” is a domain registrar based in Phoenix, Arizona, and it also provides hosting. As the name suggests, pricing is low, and for WordPress hosting it has built a separate EasyWP brand aimed at providing comfort beyond the price point.
30-day free trial
| Server type | Shared hosting |
| Speed (TTFB) | 440ms |
| Recommended plan and term | EasyWP Starter 1 year |
| Trial / money-back guarantee | 30-day money-back guarantee |
| Monthly price (12-month contract) | US$2.98 (437 yen) |
| Initial setup fee | Free |
| Free domain | None |
| Support | 24/7 chat |
| Uptime | 99.9% |
| Storage | 10GB |
| Number of databases | 1 |
| SSL | FreeSSL |
| Backup | Yes |
| Email accounts | None |
| Email security | None |
| Server / website migration service | None |
| WordPress preinstall | None |
| CDN | Free |
| Data center | Phoenix Arizona United States、Timisoara Midlands UK、Amsterdam Netherlands |
「Stellar プラン」では、ディスク容量20GB、転送量無制限、WordPress最適化が利用可能です。また、ドメイン登録との連携により、一元管理が可能です。
月額料金は$1.58から（年間契約時）で、30日間返金保証、無料独自SSL、24時間サポートが利用できます。
Pricing starts at $1.58 per month on annual billing, and a 30-day money-back guarantee, free SSL, and 24-hour support are available.
サーバー安定性（稼働率）の真実
レンタルサーバーの稼働率は、ビジネスの継続性に直結する重要な指標です。多くのサーバー会社が「99.9%」の稼働率を保証していますが、実際の測定値には差があります。
稼働率99.9%は年間8.76時間のダウンタイムを意味し、99.99%では52.56分となります。ECサイトの場合、1時間のダウンタイムが数十万円の売上損失につながる可能性があるため、0.09%の差でも重要です。
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サポート品質A Beginner's Guide to Understanding Rental Server Uptime and SLAs
サポート体制は、電話やメール、チャットなどをどの時間帯に受け付けているかなどを確認できます。でも、実際にどのような対応をしてくれるか、そのサポート品質は、使ってみないとわかりません。
You can confirm support coverage by checking whether phone, email, or chat support is available and at what times. But the actual quality of support only becomes clear once you use the service.
Personally, I found the support from Kinsta, ColorfulBox, Namecheap, and Hostinger especially courteous and quick.
Webサイトのセキュリティは、ビジネスの信頼性を左右する重要な要素です。各サーバーのセキュリティ機能を以下の観点で評価しました：
Website security is a crucial element that directly affects business reliability. We evaluated each server's security capabilities from the following viewpoints:
Main security checkpoints:
- Whether a web application firewall (WAF) is provided
- How DDoS protection is implemented
- How often automatic backups run and how long they are stored
- What type of SSL certificates are supported and how easy they are to configure
- What firewall configuration options are available
用途別！あなたに最適なサーバーはコレ
企業サイト・コーポレートサイト向け
企業サイトでは、安定性と信頼性が最重要です。ダウンタイムが企業の信用失墜につながる可能性があるため、以下の条件を満たすサーバーを選択すべきです：
For corporate sites, stability and reliability matter most. Because downtime can damage a company's credibility, you should choose a server that satisfies the following conditions:
Recommended services:
- XServer Business: business-oriented features and a 99.99% uptime guarantee
- Kinsta: overwhelming enterprise-grade performance
- Sakura Rental Server: the stability and strong support of a major domestic provider
Key selection criteria:
- A guaranteed uptime of 99.99% or higher
- Reliable and courteous support
- Automatic backup functionality (at least once per day)
- Free dedicated SSL certificates
- A strong business email feature set
個人ブログでは、コストパフォーマンスとWordPressの動作速度が重要です。SEO対策も考慮し、以下のサーバーが適しています：
For personal blogs, cost performance and WordPress speed matter most. Taking SEO into account as well, the following services are especially suitable:
Recommended services:
- Lolipop!: the strongest value for money
- ConoHa WING: AI-focused optimization features
- XServer: high performance at a reasonable price
Key selection criteria:
- A monthly price range of roughly 500 to 1,000 yen
- Easy WordPress installation
- Support for LiteSpeed Web Server
- Free dedicated SSL certificates
- Unlimited traffic
ECサイトでは、高速性と安全性が売上に直結します。決済処理の安定性も重要な要素となります：
For ecommerce sites, speed and safety connect directly to revenue. Stable payment processing is also a major factor:
Recommended services:
- Kinsta: top-level security and speed performance
- XServer Business: business-focused security features and comfortable speed
- wpX Speed: consistently ultra-fast and stable with automatic scaling
Key selection criteria:
- SSL certificates, ideally including EV SSL
- Security aligned with PCI DSS requirements
- Fast database processing
- Automatic backups that run multiple times per day
- 24-hour monitoring systems
大量のアクセスを処理するメディアサイトでは、スケーラビリティと安定性が不可欠です：
Media sites that handle large numbers of visits require scalability and stability above all:
Recommended services:
- XServer Business: strong backbone infrastructure and excellent tolerance for high traffic
- wpX Speed: automatic scaling for traffic spikes
- mixhost: the flexibility of a cloud-based server
Key selection criteria:
- Unlimited traffic
- CDN functionality included as standard
- Automatic scaling features
- High-performance CPUs and memory
- Reverse proxy caching
The seven rules for choosing hosting without regret in 2025
1. Clarify your purpose before choosing. The required features differ greatly depending on whether you are building a personal blog, a corporate site, or an ecommerce business. Too much performance becomes wasted cost, while too little may force migration later.
2. Compare annual cost rather than initial fees. Many providers run campaigns that waive setup fees, but what matters is the total yearly cost. Be sure to factor in discounts based on contract length as well.
3. Always make use of the free trial period. Most hosts offer a free trial of around two weeks to 30 days. It is important to actually build a site and confirm the usability of the control panel and the real speed.
4. Check how complete the support system is. When technical problems occur, quick support matters. Confirm in advance whether phone support exists, what the hours are, and how strong the Japanese-language support really is.
5. Automatic backups are essential. Manual backups are easy to forget, and that can become critical when problems occur. Choose a server with automatic backups and make sure you understand the recovery process.
6. Think about future expansion. As your site grows, you may need to move to a higher plan. Confirm whether expansion is possible within the same service and how easy migration is.
速度アップのための裏技テクニック集
CDN設定で劇的に速くする方法
CDN（Content Delivery Network）は、世界各地にサーバーを配置し、ユーザーに最も近いサーバーからコンテンツを配信する技術です。適切に設定することで、表示速度を30〜50%改善できます。
A CDN (Content Delivery Network) places servers around the world and serves content from the server closest to the user. With correct configuration, it can improve display speed by 30% to 50%.
Major CDN services:
- Cloudflare (free plan available)
- AWS CloudFront (pay-as-you-go pricing)
- Google Cloud CDN (for Google Cloud users)
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画像最適化の最新手法What Is a CDN? Improve Speed and Performance with a Network of Servers
Webサイトの容量の多くを占める画像ファイルの最適化は、速度改善の最重要ポイントです。
Optimizing image files, which often account for the largest share of a website's weight, is one of the most important parts of improving speed.
Effective optimization methods:
- Use WebP format: reduce file size by roughly 25% to 35% compared with JPEG
- Use responsive images: deliver the most appropriate image size for the visitor's device
- Enable lazy loading: delay loading images that are outside the initial viewport
- Optimize compression levels: balance image quality and file size
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キャッシュ設定の極意Five WordPress Plugins for Dramatic Speed Gains and Additional Performance Improvements
キャッシュ機能を適切に設定することで、サーバー負荷を大幅に軽減し、表示速度を向上させることができます。
If cache settings are configured properly, server load can be reduced significantly and display speed can improve substantially.
Types of cache and configuration points:
- Browser cache: temporarily stores files in the visitor's browser, often configured in .htaccess
- Server cache: caches dynamic content on the server side
- Database cache: temporarily stores database query results
- Object cache: temporarily stores WordPress objects in memory
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まとめ：本当に速いレンタルサーバーの最終結論What Is Cache? Use Temporary Data Storage to Speed Up Websites
本検証の結果、2025年において最も速いレンタルサーバーは
As a result of this verification, we confirmed that the fastest hosting service in 2025 is Kinsta. Its overwhelming performance, with an average response time below 200 ms and an LCP value below 1.5 seconds, can easily justify the investment for corporate sites and high-traffic sites.
重要な選択基準:
Key selection standard: what matters most in choosing a hosting service is selecting one that supports both your current needs and future growth. Look beyond low initial fees and evaluate support quality, security features, and scalability in a balanced way.
The 2025 trend: Core Web Vitals will matter even more, and support for new technologies such as HTTP/3, WebP images, and LiteSpeed Web Server will become essential. Take the long view and choose a hosting service that can keep up with technological change.